That actually prefer it
The shape of the stem is yet another matter to consider
Its not that those of us who work in tobacco control dont think there might be changes in elasticity
doi:10.1016/j.tox.2016.04.009
Otherwise, your device wont work well and the power supply will be damaged very soon
FFR-100 Type: Air-Purifying Respirator Protection Level: A1P3 Inhalation Airflow Resistance: 30 l/min, 0.3 mbar 90 l/min, 0.6 mbar 160 l/min, 0.9 mbar Exhalation Airflow Resistance: 160 l/min, 2.0 mbar Reusable: Weight: 17.1 oz Certifications: Mask complies with the EN 136:1998 standard according to PPE Regulation (EU) 2016/425, certified by CCQS Certification Services Limited (NB2834), located at Block 1 Blanchardstown Corporate Park, Ballycoolin Road, Blanchardstown, Dublin 15, D15 AKK1, Ireland